ISO, when I posted I didn't see that checking his texts was part of your agreement. I just think even then it is pointless. He will delete incriminating texts as fast as they come in or go out. They are sooo good at making you see what they want you to see.
I feel sorry for the girls in my son's life too. Reading posts of GF and BF here, one cannot help but to.
You are in my thoughts often. As you say, in God's hands anything is possible.